Behavioral advertising, also known as behavioral targeting or behavioral marketing, is when an advertiser or advertising server hooks into the data that is stored by your browser or app, to serve you interested based ads. These things tell the advertisers and networks things such as what searches you recently conducted, what sites you visited, etc.. Behavioral advertising is increasingly being used by advertisers and their publishers (Facebook just announced they are using behavioral advertising), and consumers are becoming increasingly concerned for their privacy. So how can you opt-out of behavioral advertising?